Grizzly Bear Population Estimate and Characteristics in the Anderson and Horton Rivers Area, Northwest Territories, 1987-89

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A population estimate of 141 (95% CI, 131-276) grizzly bears (>2 yrs old) was determined using a modified Lincoln-Petersen estimate. Reducing the number of marks available in the study area by 10%/year to compensate for lack of population closure resulted in a population estimate of 127 (95% CI, 118-248) bears (>2 yrs old). Bear densities in the study area were 9.1 bears/1,000 km2 for the standard Lincoln-Petersen estimate and 8.2 bears/1,000 km2 for the adjusted Lincoln-Petersen estimate. During the 3-year research period, 154 bears (97 females, 57 males) (all ages) were captured and marked. The sex ratio of the population for all ages was 67% females and 33% males. A minimum population estimate of 102 bears (67 females, 35 males) (>2 yrs old) was calculated for the study area by only including captured bears. Bear distribution throughout the study area was clumped with bears concentrating along river and creek valleys. Fourteen bears from the area died during the research period.